Elasticity of the human false vocal fold

Area of Science:

• Biomechanics
• Vocal fold physiology
• Laryngeal tissue engineering

Background:

• The elasticity of human ventricular folds (false vocal folds) is largely unknown.
• Understanding false vocal fold mechanics is crucial for modeling phonation dynamics and aeroacoustics.

Purpose of the Study:

• To measure the elastic properties of human ventricular fold tissues in vitro.
• To investigate the potential role of false vocal fold elasticity in phonation.

Main Methods:

• Quantified uniaxial tensile stress-strain characteristics of 12 false fold specimens (6 male, 6 female) using sinusoidal deformation.
• Analyzed midcoronal sections to determine collagen, elastin, glandular, and adipose tissue densities via digital image analysis.

Main Results:

• Observed nonlinear stress-strain curves with hysteresis, indicating viscous energy loss.
• Determined the elastic modulus using a hybrid linear-exponential model.
• Found male false vocal folds to be approximately twice as stiff as female false vocal folds at 20-30% tensile strain.

Conclusions:

• Preliminary data suggest a gender-related difference in false vocal fold elasticity.
• Higher glandular tissue proportion in female false vocal folds may contribute to lower elasticity.
• Findings can inform biomechanical models of phonation and laryngeal reconstruction.